Self-air-entraining ternary hydraulic jump stilling basin

Abstract

The invention discloses a self-air-entraining ternary hydraulic jump stilling basin. The stilling basin is provided with reverse-arc fillets and a reverse-arc step-down floor on a junction of a discharge chute and the stilling basin; two sides of a head side wall of the stilling basin are independently provided with an aeration shaft; the middle of the stilling basin is provided with a flow splitting pier and a middle partition wall; the middle part and the tail parts of the side wall and the middle partition wall of the stilling basin are independently provided with a lateral fillet; the middle and the tail of the bottom plate of the stilling basin are independently provided with a stilling ridge; therefore, binary hydraulic jump of a conventional stilling basin is transformed into ternary hydraulic jump, a strong friction and mixing function of a water body in the hydraulic jump can be enhanced, the energy dissipation power of the stilling basin is improved, the length and the depthof the conventional stilling basin can be reduced, the engineering quantity of the stilling basin is lowered, and engineering investment is lowered. Due to the arrangement of the shaft, the bottom ofthe stilling basin can be subjected to self air entraining, under a turbulent fluctuation function of a high-speed water flow, a great quantity of air is forced to be mixed into the water flow so as to form a gas and water two-phase mixing phenomenon, the air-entraining concentration of the water body is guaranteed, the bottom plate and the side wall of the stilling basin are protected from cavitation destruction, and the safety of a structure is guaranteed.

Description

technical field [0001] The invention relates to a self-aeration three-element hydraulic stilling pool, which belongs to the technical field of water conservancy and hydropower engineering. Background technique [0002] In water conservancy and hydropower engineering, for the high-speed discharge flow, in order to reduce the erosion of the natural channel behind the dam and ensure the safety of the main body of the dam, three energy dissipation methods are mainly used to dissipate the energy of the discharge flow: deflecting flow energy dissipation, bottom flow dissipation energy, surface flow energy dissipation. When the topographical conditions of the energy dissipation area of ​​the discharge flow are limited, the erosion resistance of the riverbank and the river bed is poor, and the downstream water level is shallow and the water level varies greatly, the energy dissipation method of the discharge flow generally adopts the bottom flow energy dissipation method. Underflow...

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Problems solved by technology

However, when the conventional stilling pool structure is adopted, in order to form a complete binary hydraulic jump, the length of the stilling pool is often longer and the pool depth is also deeper, resulting in a large amount of earthwork excavation and concrete pouring, which increases the project investment

In addition, the flow velocity of the water discharged from the chute to the head of the stilling basin is the highest. It is generally believed that when the flow velocity of the discharged water is greater than 35m / s, it is easy to cause cavitation damage to the bottom plate and side walls of the stilling basin, endangering the safety of the structure. Pools often do not have special aeration and corrosion reduction measures

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